/Engine/Source/Editor/LandscapeEditor/Public/LandscapeToolInterface.h
virtual [TOptional](API\Runtime\Core\IO\TOptional)< bool > InputKey ( [FEditorViewportClient](API\Editor\UnrealEd\FEditorViewportClient) * InViewportClient, [FViewport](API\Runtime\Engine\FViewport) * InViewport, [FKey](API\Runtime\InputCore\FKey) InKey, EInputEvent InEvent )